Installation and Operation Manual Chapter 6 Troubleshooting and Diagnostics
ASMi-52 Ver. 2.5 Testing ASMi-52 6-17
Bit Error Rate Test (BERT)
It is possible to generate BERT+RLB or BERT (from both CO and CPE) in
multiplexer and E1 and DTE Serial single units.
The BERT, RLB + BERT can be set only if there is a connection to the FE unit.

BERT Patterns

The following are the BERT test patterns that can be selected:
• 2E15-1
• Mark
• Space
• Alternate
BERT has a possible Single Error injection only.
The BERT performance counters are as follows:
• Error bits – the total number of bit errors detected
• BERT total time – the total time the test is running in seconds
• Bert error time – the total number of seconds in which errors have been
detected – in seconds
• BERT Sync Loss – the number o f times Sync Loss was detected since BERT
started to run
• BERT result – the number of error bits divided with the total number of data
bits. This item holds 1 byte for the exponent and 2 bytes for the mantissa
holding 1 byte before the period and 1 byte after the period
• BERT Sync Loss state – the Sync Status while BERT runs. The BERT Sync Loss
state has the following values:
SyncLoss = 0
Sync = 1
• BERT sync run time – the total number of seconds in which sync have been
detected – in seconds
• BERT total bits – the total number of bert bit.
To select the BERT patterns values for Local and Remote tests:
1. From the Diagnostics menu, select Local/Remote Test (Main menu >
Monitoring > Local/Remote Test).
The Local/Remote Test menu is displayed (see Figure 6-23).
2. From the Local/Remote Test menu, select BERT.
The BERT menu is displayed.